GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Brake Pads

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REMOVAL & INSTALLATION




CAUTION
Always replace all pads on both rear wheels at the same time. Failure to do so will result in uneven braking action and premature wear.

1988-92 Vehicles

See Figures 1, 2, 3 and 4



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Fig. Fig. 1: Use a suitable prybar to detach the buttons...



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Fig. Fig. 2: ... then remove the outboard pad from the caliper



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Fig. Fig. 3: Remove the inboard pad and pad retainer (if necessary



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Fig. Fig. 4: Before installing the pad, use a pair of pliers to bottom out the caliper piston

  1. Raise the vehicle and support with jackstands.
  2.  
  3. Remove the rear wheel and tire assemblies.
  4.  
  5. Remove the rear caliper and hang by the suspension with a piece of wire to prevent brake hose damage. Refer to the Caliper removal procedures in this section for assistance.
  6.  
  7. Using a suitable prybar, disengage the buttons on the outboard pad from the holes in the caliper housing, then remove the outboard pad.
  8.  
  9. Press in on the edge of the inboard pad and tilt outward to release the pad from the pad retainer.
  10.  
  11. Remove the two way check valve from the end of the caliper piston using a small prybar.
  12.  

To install:

Do NOT allow pliers to contact the actuator screw. Protect the piston so the contact surface does not get damaged.

  1. Bottom the piston into the caliper bore by positioning 12 in. (305mm) adjustable pliers over the caliper housing and piston surface.
  2.  
  3. Lubricate a new two way check valve and install it into the end of the piston.
  4.  
  5. Install the inboard brake pad. Engage the pad edge in the retainer tabs closest to the caliper bridge. Press down and snap the tabs at the open side of the caliper. The wear sensor should be at the leading edge of the pad during wheel rotation. The back of the pad must lay flat against the piston. The button on the back of the pad must engage the D-shaped notch in the piston.
  6.  

If the piston will not align or retract into the bore. Turn the piston clockwise using a piston turning tool J-7624 or equivalent.

  1. Install the outboard brake pad. Snap the pad retainer spring into the slots in the caliper housing. The back of the pad must lay flat against the caliper.
  2.  
  3. Install the caliper onto the mounting bracket as outlined in this section.
  4.  
  5. Apply force at least three times to the brake pedal to seat the brake pads before moving the vehicle.
  6.  
  7. Install the rear wheels.
  8.  
  9. Lower the vehicle and check for fluid leaks.
  10.  

1993-96 Vehicles
  1. Remove about 2 / 3 of the brake fluid from the reservoir with a clean syringe or baster type utensil.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Matchmark the relationship of the wheel to the axle flange. Remove the wheel and tire assembly.
  6.  
  7. Reinstall two lug nuts to retain the rotor.
  8.  
  9. Unfasten the bolt and washer attaching the cable support bracket to the caliper body assembly. It is not necessary to disconnect the parking brake cable from the caliper parking brake lever or disconnect the brake hose unless the caliper is to be completely removed from the vehicle. Freeing the cable support bracket allows enough flexibility in the cable to pivot the caliper up and down and remove the shoe and lining.
  10.  
  11. Remove the sleeve bolt.
  12.  
  13. Pivot the caliper body assembly up. Do not completely remove the caliper assembly body.
  14.  
  15. Remove the outboard and inboard shoe and linings (pads) from the caliper support.
  16.  
  17. Remove the two pad clips from the caliper support.
  18.  

To install:
  1. Bottom the piston assembly into the caliper bore. Use a suitable spanner-type tool in the piston slot to turn the piston assembly and thread it into the caliper body assembly.
  2.  
  3. After bottoming the piston, lift the inner edge of the boot next to the piston assembly and press out any trapped air. The boot must lie flat. Make sure the slots in the end of the piston are positioned correctly before pivoting the caliper body assembly down over the shoe and lining in the caliper support. Use a suitable spanner-type tool in the piston slots to turn the piston as necessary.
  4.  

Whenever installing new pads, install new pad clips. These should be provided in the disc pad kit.

  1. Install the two pad clips in the caliper support.
  2.  
  3. Install the outboard and inboard shoe and lining in the caliper support. The wear sensor is on the outboard pad. The sensor is positioned downward at the leading edge of the rotor during forward wheel rotation. Hold the metal shoe edge against the spring end of the clips in the caliper support. Push the shoe in toward the hub, bending the spring ends slightly, and engage the shoe notches with the support abutments.
  4.  
  5. Pivot the caliper body assembly down over the shoe and lining assembly. Be careful not to damage the piston boot on the inboard. Compress the sleeve boot by hand as the caliper body moves into position to prevent boot damage.
  6.  
  7. After the caliper body is in position, recheck the installation of the pad clips. If necessary, use a small prytool to re-seat or center the pad clips on the support abutments.
  8.  
  9. Install the sleeve bolt and tighten to 20 ft. lbs. (27 Nm).
  10.  
  11. Install the cable support bracket (with the cable attached) with the bolt and washer. Tighten the bolt to 32 ft. lbs. (43 Nm).
  12.  
  13. Remove the two lug nuts retaining the rotor.
  14.  
  15. Install the wheel and tire assembly, aligning the marks made during removal.
  16.  
  17. Carefully lower the vehicle, then firmly depress the brake pedal 3 times to seat the pads against the rotors.
  18.  

INSPECTION



The pad thickness should be inspected every time that the wheels are removed. Pad thickness can be checked by looking down through the inspection hole in the top of the caliper. If the thickness of the pad is worn to within 0.030 inch (0.76mm) (if the pads are the riveted type, be sure not to include the thickness of the rivets when measuring pad thickness), all the pads should be replaced. A thermal material is sandwiched between the lining and backing. Don't include this material when determining the lining thickness.

This is the factory-recommended measurement. Your state's automobile inspection laws may be different.

 
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